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Resizing window when running python TUI app results in crash #18538

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opened 2026-01-31 06:17:05 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 06:17:05 +00:00
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Originally created by @sandos on GitHub (Sep 26, 2022).

Windows Terminal version

1.16.2641.0

Windows build number

10.0.190044.1889

Other Software

python 3.10.6
prompt_toolkit 3.0.30

Steps to reproduce

In my prompt_toolkit python app, if I vigorously resize the terminal window it eventually crashes. This only happens with Atlas Engine enabled in settings. Attaching Visual Studio points to a memory related issue.

Iv'e had trouble making my python program smaller and still exhibit the problem, so I am unable to share it at the moment. I can reproduce it easily though. It does use an emoji (), but nothing special as far as I know other than that.

Attached a few different backtraces:
bt1.txt
bt2.txt
bt3.txt
bt4.txt
bt5.txt

The small program I tried to reproduce this bug with is here, it does not quite do it though but should be close:
https://gist.github.com/sandos/fc1ae1d5abf0e9609228b18766a49612

Expected Behavior

No crash on resizing window.

Actual Behavior

Windows Terminal Preview crashes silently.

Originally created by @sandos on GitHub (Sep 26, 2022). ### Windows Terminal version 1.16.2641.0 ### Windows build number 10.0.190044.1889 ### Other Software python 3.10.6 prompt_toolkit 3.0.30 ### Steps to reproduce In my prompt_toolkit python app, if I vigorously resize the terminal window it eventually crashes. This only happens with Atlas Engine enabled in settings. Attaching Visual Studio points to a memory related issue. Iv'e had trouble making my python program smaller and still exhibit the problem, so I am unable to share it at the moment. I can reproduce it easily though. It does use an emoji (), but nothing special as far as I know other than that. Attached a few different backtraces: [bt1.txt](https://github.com/microsoft/terminal/files/9646551/bt1.txt) [bt2.txt](https://github.com/microsoft/terminal/files/9646552/bt2.txt) [bt3.txt](https://github.com/microsoft/terminal/files/9646553/bt3.txt) [bt4.txt](https://github.com/microsoft/terminal/files/9646554/bt4.txt) [bt5.txt](https://github.com/microsoft/terminal/files/9646555/bt5.txt) The small program I tried to reproduce this bug with is here, it does not quite do it though but should be close: https://gist.github.com/sandos/fc1ae1d5abf0e9609228b18766a49612 ### Expected Behavior No crash on resizing window. ### Actual Behavior Windows Terminal Preview crashes silently.
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Reference: starred/terminal#18538
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